Expert Verified Updated: March 2026

Copper Algaecide Dosage Calculator

Calculate powerful copper-based doses for stubborn mustard or black algae while preventing pool surface staining.

Quick Conclusion
Copper-based algaecides are extremely effective against mustard and black algae. Use sparingly (approx 1 oz per 5,000 gallons) to avoid staining pool liners or turning hair green. Maintain copper levels below 0.4 ppm.

Technical Comparison

Factor Copper (Chelated) Standard Algaecide
Killing Power Very High Moderate
Staining Risk Moderate (Metal) Low (Foam)
Stability Sun-Proof Degrades in Sun
Best For Black/Yellow Algae Green Algae Prev

Actionable Steps

Pro-Tip

High copper levels + high pH = purple or green staining on plaster. Always keep your pH below 7.8 when using copper minerals.

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